<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 进度条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-position="top"
        label-width="100px"
      >
        <!-- tab栏区域 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price" type="number">
              <el-input v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight" type="number">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number" type="number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <!-- props 绑定验证规则 -->
            <el-form-item label="商品分类" prop="goods_cate">
              <!-- v-model绑定的数组(选择的项) 
                    options绑定数据
                    props
              -->
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到的后台api地址 -->
            <el-upload
              :action="actionUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 表单验证规则对象
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请输入商品分类', trigger: 'blur' }]
      },
      catelist: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTabData: [],
      // 静态参数列表数据
      onlyTabData: [],
      actionUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '', // 图片预览地址
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      let { data: res } = await this.$axios.get('categories')
      if (res.meta.status !== 200) {
        this.$message.error('获取分类参数失败')
      } else {
        this.catelist = res.data
        console.log(catelist)
      }
    },
    // 级联选择器发生变化,触发的函数
    handleChange() {
      console.log(this.catelist)
      console.log(this.addForm.goods_cat)
      // 判断选择的是否是第三级菜单
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      console.log(`要离开的标签页名字:${oldActiveName}`)
      console.log(`要进入的标签页名字:${activeName}`)
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    async tabClicked() {
      //   console.log(this.activeIndex) // 打印的点击tab标签name
      // 证明访问的是动态参数列表(商品参数)
      if (this.activeIndex === '1') {
        // let { data: res } = await this.$axios.get(`categories/${this.addForm.goods_cat[2]}/attributes`, { params: { sel: 'many' } })
        let { data: res } = await this.$axios.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        console.log(res)

        if (res.meta.status !== 200) {
          this.$message.error('获取动态参数列表失败')
        } else {
          res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTabData = res.data
          console.log(this.manyTabData)
        }
      } else if (this.activeIndex === '2') {
        // 获取静态参数列表(商品属性)
        let { data: res } = await this.$axios.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          this.$message.error('获取商品属性失败')
        } else {
          // res.data.forEach(item => {
          //   item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          // })
          this.onlyTabData = res.data
          console.log(this.onlyTabData)
        }
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理图片移出的操作
    handleRemove(file) {
      // console.log(file)
      // 1 获取将要删除的图片临时路径
      // 2 从pics数组中,找到这个图片对应的索引值
      // 3 调用数组的splice方法,把图片信息对象,从pics中移除
      let filePath = file.response.data.tmp_path
      let i = this.addForm.pics.findIndex(item => item.pic === filePath)
      // console.log(i + '9999')

      this.addForm.pics.splice(i, 1)
      console.log(this.addForm.pics)
    },
    handleSuccess(response) {
      console.log(response)
      // 1 拼接得到一个图片信息对象
      // 2 将图片信息对象,push到pics图片数组
      let picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    add() {
      console.log(this.addForm.goods_introduce)
      // 预校验数据
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          this.$message.error('请填写必要的表单项')
        } else {
          // 执行添加数据
          // 因为级联选择绑定的goods_cat要是数组,但是这里传参的goods_cat需要是字符串,
          // 所以可以通过深拷贝的方式
          // lodash  cloneDeep(obj)
          let addform = _.cloneDeep(this.addForm)
          addform.goods_cat = addform.goods_cat.join(',') // 转字符串
          // 处理动态参数
          this.manyTabData.forEach(item => {
            let manyInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ') // 动态属性里这个要转成字符串
            }
            this.addForm.attrs.push(manyInfo)
          })
          // 处理静态参数
          this.onlyTabData.forEach(item => {
            let onlyInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals // 静态属性里就是字符串
            }
            this.addForm.attrs.push(onlyInfo)
          })
          addform.attrs = this.addForm.attrs
          console.log(addform)

          // 发起请求添加商品
          // 商品的名称,必须是唯一的
          let { data: res } = await this.$axios.post('goods', addform)
          console.log(res)
          if (res.meta.status !== 201) {
            this.$message.error('添加商品信息失败')
          } else {
            this.$message.success('添加商品信息成功')
            this.$router.push('/goods')
          }
        }
      })
    }
  },
  computed: {
    //   计算商品参数id
    cateId() {
      if (this.addForm.goods_cat.length !== 3) {
        return null
      } else {
        return this.addForm.goods_cat[2]
      }
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>